UFC 4-023-03
25 January 2005
5-2.4
Internal Ties.
Design steel members acting as internal ties, and their end connections, to be
capable of resisting the following required tie strength, which need not be considered as
additive to other loads.
In SI units, the required tie strength is:
0.5 (1.2D + 1.6L) st Ll
but not less than 75 kN
Dead Load (kN/m2)
where:
D
=
Live Load (kN/m2)
L
=
Ll
=
Span (m)
st
=
Mean transverse spacing of the ties adjacent to
the ties being checked (m)
In English units, the required tie strength is
0.5 (1.2D + 1.6L) st Ll
but not less than 16.9 kips
Dead Load (lb/ft2)
where:
D
=
Live Load (lb/ft2)
L
=
Ll
=
Span (ft)
st
=
Mean transverse spacing of the ties adjacent to
the ties being checked (ft)
5-2.5
Peripheral Ties.
In SI units, peripheral ties must be capable of resisting:
0.25 (1.2D + 1.6L) st Ll but not less than 37.5 kN
In English units, peripheral ties must be capable of resisting:
0.25 (1.2D + 1.6L) st Ll but not less than 8.4 kips
5-2.6
Tying of External Columns.
The required tie strength for horizontal ties anchoring the column nearest to
the edges of a floor or roof and acting perpendicular to the edge is equal to the greater
of the load calculated in Section 5-2.4 or 1% of the maximum factored vertical dead and
live load in the column that is being tied, considering all load combinations used in the
design.
5-4
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